Originally Posted by Pelican170

Hmmnn, well that "low, mid, high" seems kinda crappy in general. Now, with speakers and sound, Low Hz, is more bass and the higher the Hz, less bass present. But that may not be what your HU is doing because its a manufacturer HU, correct? To me, thats the main problem and I would upgrade that, but again, im assuming its the head unit with Nav? so you dont wanna do that.

The other problem you may find, is that if you get better tweeters, they most likely will accept higher watts. This in turn means they are going to be underpowered from the HU if you aren't running an amp to them. This could lead to them not sounding as "loud" as you may want them.

Another issue with distortion, is that a lot of the time it is actually the power source that is sending the distortion and not necessarily the speakers.

Sorry if I have made confusion for you but these are the things that I have seen in the past. If it were me, I suppose I would start by upgrading the tweeters and seeing how that sounds to you. If its still not to your liking, then I would opt to get an amp to power the speakers. This way you should be able get one that has crossover frequency controls as well...